Honda Acura NSX 1991, Service Manual, Page: 1128 / 1420

Interlock System
-Control Unit Input Test
Disconnect the 8-P connector from the control unit.
Make the following input tests at the harness pins. If all
tests prove OK, yet the system still fails to work, substi-
tute the control unit with a known-good one. If the sys-
tem is OK, replace the control unit.
INTERLOCK CONTROL UNIT
NOTE: If the shift lock solenoid clicks when the ig-
nition switch is ON and the brake pedal is pushed
(the shift lever is in the P position), the shift lock
sys-
tem is electronically normal. If the shift lever can-
not be shifted from P position, see page 23-l 56 and
section 14.
CONNECTOR
Shift Lock System: View from wire side
No. Wire Test condition
Test: desired result Possible cause (if result is not obtained)
1
2
3
Ignition switch ON.
Check for voltage to ground:
l
Blown No. 45 A) fuse.
Brake pedal pushed. should be battery voltage.
l
Faulty brake light switch.
Ignition switch ON. Check for voltage to ground:
l
Faulty throttle angle sensor.
Step on the brake pedal
should not be battery voltage.
l
Faulty A/T control unit.
and the accelerator at
l
An open in the wire.
the same time.
Shift lever position in P. Check for continuity to ground:
l
Faulty position console switch.
should be continuity.
l
Poor ground
l
An open in the wire.
Ignition switch ON. Check for voltage to ground:
l
Blown No. 5 A) fuse.
should be battery voltage.
l
Faulty shift lock solenoid.
l
An open in the wire.
Key Interlock System:
No.
Wire Test condition Test: desired result Possible cause (if result is not obtained)
1
BLK
Under all conditions. Check for continuity to ground:
l
Poor ground
should be continuity.
l
An open in the wire.
Shift lever position in P. Check for continuity to ground:
l
Faulty shift position console
2
should be continuity.
l
Poor ground (G401,
l
An open in the wire.
Ignition switch turned Check for voltage to ground:
l
Blown No. 45 A) fuse.
3
to ACC and the key should be battery voltage.
l
Faulty steering lock assembly
pushed in.
(key interlock solenoid).
l
An open in the wire.
Ignition switch turned Check for voltage to ground:
l
Blown No. 45 A) fuse.
4
to ACC and the key
should be battery voltage.
l
Faulty steering lock assembly
pushed in.
(key interlock solenoid).
l
An open in the wire.
23-142